I think a key element in the transaction is the dealer. While I think the manufacturer should but a lot of emphasis on QC the dealer is the last link in the QC chain. A good dealer will go through a trailer to eliminate issues before the customer ever sees them. An RV is a complex item, part vehicle, part house so the fact that a few minor things slip through shouldn't be surprising. But the dealer should have inspected all the major and minor systems, cosmetics, etc. as the last representative of XYZ manufacturer. I place a lot of blame on the dealer when an RV is driven/towed off the lot with numerous issues. And yes, the customer has a responsibility also.
I've heard mostly good things about Jayco so I hope somehow the issues get resolved to your satisfaction.